smaller Hexagonal or odd-shaped field, no alliances, maybe 1 v 1 or FFA with multiple and it'll be an arm game with elements to be picked up and placed.
The deletion of the 1999 game (link below) and replacement of it with the 1997 game is definitely significant (recycling 1997). 1999 was the first year with alliances as mentioned in the video but it was also the first year with a regular rectangular shaped field (disregarding 1992 which was a raised square sandbox) and every field since has been a regular rectangular shape. I believe that alliances and the rectangular shaped field will both be done away with for the coming game. Also when the guy opens the game manual he flips to the first pages which described the field in the 2014 game manual. Finally, it will be similar but a variation on the 1997 game because the 1997 game is the one being recycled so it will be some sort of arm game.
1999 Game:
https://www.youtube.com/watch?v=Q0CDop_IwW8
Link to FRC 2015 Game Hint:
https://www.youtube.com/watch?v=aAETANAiLw0